Which acts as inhibitor for knocking in combustion of petrol?
(a) (C2H5)4Pb (b) Ni(CO)4
(c) both (a) and (b) (d) none of these
(c) Both are antiknock compounds.
Which does not show Tyndall effect?
(d) sugar solution does not shows Tyndall effect. Rest all the options shows this effect.
Among the following surfactant molecules, the surfactant that forms micelles in aqueous solution at the lower CMC at ambient condition is:
(a) More is the hydrophobic character in surfactant molecule lesser is CMC in aqueous solution.
Butter is a colloid form in which:
(a) fat is dispersed in solid casein
(b) fat globules are dispersed in water
(c) water is dispersed in fat
(d) suspension of casein is in water
(c) Butter is an w/o emulsion having fat dispersed in water.
The cotterells precipitator is used to :
(a) neutralize charge on carbon particles in air in smoke
(b) coagulate carbon atoms of smoke
(c) bring in cataphoresis in carbon particles
(d) all of the above
(d) The negatively charged carbon particles in air (smoke) are moved towards anode due to cataphoresis, where they are neutralized to left free air. The process is used to control air pollution.
Foam is a colloidal solution of:
(a) gaseous particles dispersed in gas (c) solid particles dispersed in a liquid
(b) gaseous particles dispersed in a liquid (d) solid particles dispersed in gas
(b) Foam is a colloidal state of gas dispersed in liquid (froths) or in solid, i.e., solid foam (mattresses).
A liquid aerosol is a colloidal system of:
(a)a liquid dispersed in a solid
(b)a liquid dispersed in a gas
(c)a gas dispersed in a liquid
(d) a solid dispersed in a gas
(b) Liquid aerosol involves liquid dispersed in gas, e.g., cloud, fog , mist, etc.
Negative catalyst or inhibitor is one:
(a) which retards the rate of reaction
(b) takes the reaction in forward direction
(c) promotes the side reaction
(d) none of the above
(a) The definition of negative catalyst.
Alum helps in purifying water by:
(a) forming Si complex with clay particles
(b) sulphate part which combines with the dirt and removes it
(c) aluminium which coagulates the mud particles
(d) making mud water soluble
(c) Al3+ is very good coagulating agent for -ve sol (muddy water).
Which of the following does not form anionic micelle?
(a) C12H25COONa (b) C12H25SO4Na
(c) C12H25SO3Na (d) C12H25(NH3)3Cl
(d) In a, b, c anionic micelle is formed.